.doc {
  position: fixed;
  top: 100px;
  left: 280px;
  right: 0;
  bottom: 0;
  z-index: 1;
  overflow-y: scroll;
}
.doc-nav {
  position: fixed;
  z-index: 10;
  top: 100px;
  left: 0;
  bottom: 0;
  padding: 0px 0 30px 60px;
  width: 260px;
  margin-right: 20px;
  overflow-x: hidden;
  overflow-y: auto;
  background: #fff;
}

.doc-nav .main-menu {
  margin-bottom: 20px;
  padding-left: 0;
  line-height: 1.8em;
}

.main-menu ul {
  list-style-type: none;
  margin: 0;
  padding-left: 1em;
}

.main-menu ul span {
  color: #7f8c8d;
}


.main-menu ul a {
  font-weight: bold;
}

.doc-view {
  position: relative;
  padding: 2.2em 0;
}
